Air fan



Feb. 2, 1932. A. H. ROBINSON AIR FAN Filed Dec. 3, 1928 2 Sheets-Sheet l Feb. 2, 1932. H ROBINSON 1,843,786

AIR FAN Filed Dec. 5, 1928 2 Sheets-Sheet 2 gwuwntoz :Juam 1 6mm Patented Feb. 2, 1932 zumrao STATES ATENT OFFICE nrnun a. nonmson, or naxnwoon, omo, assrenon ro me an. nonmson cou- Part or mssmnou, care, A conrona'rron' or 0310 am ran My invention relates to air fans, mounted on a portable base and operating in a duct, and adapted for increasing the circulation of air from hot air registers, or into the cold air shafts of a hot air furnace.

The objects of the present improvements are to provide an air fan of this description, which may be applied either to horizontal or vertical registers, which is constructed in a simple and compact manner, and in which vibration is not imparted from thefan to the duct and base.

These and ancillary objects are attained in the presentimprovements as will hereinafter be set forth in detail and claimed.

A preferred embodiment of the improvements is illustrated in the accompanying drawings forming part hereof, in which Figure 1 is a fragmentary isometric view of the improved air fan;

Fig. 2, a top plan view thereof;

Fig. 3, a front elevation view thereof;

Fig. 4, a fragmentary diagrammatic View illustrating the fan in use with a vertical hot air register;

Fig. 5, a fragmentary diagrammatic view illustrating the fan in use w1th a horizontal hot air register; and

A. combined fan blade guard and motor mounting frame indicated generally at 15 encloses the fan blades and mounts the motor.

The frame 15 is itself mounted on a base indicated generally at 16, and which is adapted for resting upon a flat surface to maintain the shaft either horizontal as illustrated in Fig. 4, or vertical as illustrated in Figs. 5 and 6.

The base 16 preferably comprises a duct 17 coaxial with the motor and within which The duct 17 is preferably in the form of a. cylindric tube, and the frame 15 preferably includes a plurality of longitudinally extending circumferentially spaced outer mem bers 19 upon each of which a bushin of resilient material20 is applied, and w ich may be felt, insulating tape, or rubber tubing, for the purpose of absorbing vibrations in the frame set up by the operation of the fan and which would otherwise cause a bum due to the sounding-board action of the tubular duct 17.

In addition to. the tubular duct 17, the base 16 includes longitudinally spaced supporting feet 21 having parallel outer edges 22 arranged to restupon the surface of the door 23 or the like for maintaining the fan shaft horizontal; and either end of the duct 17 is preferably finished so that its plane is perpendicular with the shaft 12 whereby the fan may be supported thereon for maintaining the shaft vertical.

As illustrated in Fig. 4 the shaft is maintained horizontal for use in connection with a vertical hot air register 24, and the fan blades are positioned toincrease the velocity of the flow of hot air out of the register as indicated by the arrows. In Fig. 5 the fan is in use with a horizontal hot air register 25 with the shaft maintained vertical and'the fan blades positioned to increase the velocit of the flow of hot air out of the horizontal ot air register.

In Fig. 6 the shaft is similarly maintained vertical and the fan blades are positioned op.

posite to that shown in Fig. 5, whereby an increased velocit of airflow into. the coldair register 26 is induced.

Accordingly one of the improved portable the frame 15 is secured as by means of clamps fans embodying the present improvements may be utilized in any desired hot air register or cold air register in a hot air heating systerm for increasing the air flow therefrom or therein.

I claim:

1. An air fan including fan blades, rotary means for operating the blades to induce a flow of air, guard means connected with the operating means surrounding the blades,-a'

tubular duct coaxial with the operating means and open at both ends, means connecting the periphery of the ard means with. the tubular duct interm to the ends of 5 the duct, and means extending from the tubu= lar duct having surfaces parallel with and perpendicular to the axis of the operating means, whereby the fan is ada ted to be supported on either of said sur aces for selecw tively positioning the blades to induce a horizontal or a vertical flow of air.

2. An air fan including fan blades, rotary means for operating the blades toinduce a flow of air, guard means connected with the operatin means surrounding the blades, a tubular uct coaxial with and surrounding the o crating means, means connecting the Peri cry of the guard means with the tubuar uct intermediate the ends of the duct, vi-

:9 bration absorbing means" at the connection between the guard means and tubular duct for absorbing vibrations set. 11 by the operati means, and means exten 'ng from the tubu ar duct having surfaces parallel with and perpendicular to the axis of the operating means, wherebythe fan is adapted to be suprted on either of said surfaces for selectivey positioning the blades to induce a horizontal or a vertical flow of air.

10' 3. An air fan including fan blades, means for operating the blades to induce a flow of air, guard means surrounding the blades and connected with the operating means, means supportin the guard means, the supporting as means inc uding a tubular member encircling and extending over the guard means and the operating means, resilient bushin spaced at intervals around the periphery o the guard means, and brackets on the tubular member so clamped around said bushings resiliently connecting the guard means to the supporting means. e v

' In testimony that I claim the above, I have hereunto subscribed 111 name.

as v .AR H; ROBINSON. 

